Schott LaK N7, 334nm - 2325nm
USER
2 1
SQRT(1+B1*wvl^2/(wvl^2-C1)+B2*wvl^2/(wvl^2-C2)+B3*wvl^2/(wvl^2-C3))
0
B1	1.23679889E+00;
B2	4.45051837E-01;
B3	1.01745888E+00;
C1	6.10105538E-03;
C2	2.01388334E-02;
C3	9.06380380E+01;